Communication control apparatus is provided for implementing a call relay service that makes it possible to construct and utilize a call relay network easily and reliably without relying upon special devices and a call relay list. Operation for the flush-posted-write-before-read mode is set in a first processor block interface coupled to programmable logic fabric. The task groups are placed within a specific multiple tier hierarchy, and database system resources allocated to the task groups according to their placement within the hierarchy. The light emitting layer contains an adhesive material, and a second scintillator material added thereto for detecting \u03b1 ray. A support system is provided for each outboard gearbox including a cradle connected to the bearing points on the hull.